I am in the process of writing AWS Synthetics Canary functions to continually check the health of the my JAMES IMAP and SMTP servers.  I know I could set up a full IMAP or SMTP session with id/pw and try to read mail with imap and send something with smtp.  That would definitely prove that IMAP and SMTP are up.  But I'm just curious if there are any simpler heartbeat-type requests that I can make to each server where I can determine if the servers are still up and running.   I'd prefer not to have to send an email continually every 5 minutes.  Has anybody got suggestions for the best way to get do a heartbeat test om IMAP and SMTP?

Thx


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